在热模拟机上测试了16MnCr5钢经1200 ℃加热的未变形奥氏体、在860 ℃经50 %压缩变形奥氏体的CCT曲线和维氏硬度，研究了其相变组织。结果表明：未变形奥氏体以0.025 ℃/s连续冷却时和在860 ℃变形的未再结晶奥氏体以0.2 ℃/s连续冷却时及1100 ℃变形的再结晶奥氏体分别以0.05 ℃/s连续冷却和快冷至660 ℃等温退火时均得到多边形铁素体+珠光体组织。
Investigations were conducted upon transformation and microstructure change of austenite during controlled cooling processes with different prior states.CCT diagrams were determined for austenite without deformation and with 50 % compressive deformation at 860 ℃,respectively,after reheating 1200 ℃.The hardness of the dilatometric specimens was measured and optical micrographs were obtained.The compressive deformation at 860 ℃ promotes polygonal ferrite transformation during continuous cooling.Pearlite+polygonal ferrite are formed in the un-deformed and un-recrystallized austenite when cooled at a cooling rate no more than 0.025 ℃/s and 0.2 ℃/s，respectively.Pearlite+polygonal ferrite are formed when the steel is continuously cooled at rate no more than 0.05 ℃/s and held isothermally at 660 ℃,after deformation at 1100 ℃ at which austenite is recrystallized dynamically.
参考文献
| [1] | Bramfitt B L;Speer J G .A Perspective on the Morphology of Bainite[J].Metallurgical and Materials Transactions,1990,21:817-829. |
| [2] | Pham T T;Hawbolt E B;Brimacombe J K .Prediction the Onset of Transformation Under Noncontinuous Cooling Conditions[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1995,26:1987. |
| [3] | 陈景榕;李承基.金属与合金中的固态相变[M].北京:冶金工业出版社,1997:95-101. |
| [4] | 李箭;孙福玉 .变形奥氏体→先共析铁素体相变动力学的研究[J].金属学报,1990,26:A378. |
| [5] | 李箭;孙福玉 .变形奥氏体对先共析铁素体等温形成孕育期的影响[J].金属学报,1990,26:A396. |
| [6] | 刘振宇;王国栋;张 强.变形奥氏体-铁素体的热力学计算[J].钢铁研究学报,1994(06):31. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%